My experience,
plant therapy has the best knockdown. If u can get some. Then every 3 days rotate between
plant therapy and
azamax. It should eliminate them. I’d also toss that coco. Replant if possible into new media. I’ve never seen them in media so I’m wondering if you got a batch that is infested. May also have root aphids as the pic is very similar to root aphids. Check for ants, if there are ants in your grow area or around your media, chances are that they are the ones bringing those suckers in. Also
hydrogen peroxide works well as a root drench and will kill many types of bugs including any beneficials, 33% solution ( at Walgreens) 50-50 mix with water, and soak the pot. You will need to reintroduce beneficials once done, half life of peroxide is about 36 hours so you can flush and feed after that hold period. Add whatever beneficials you were using back in. Any remaining coco, bake em out, 210dgF 2 hours in an oven will sterilize any media. Note ; do not use the convection mode ! Lol, bloody mess with the fan blowing that shit everywhere. Now I make pouches with foil and do small packets of sorts to sterilize media.